Re: broken maxcpus in 2.4.24

[James Schmidt]

Hope this hasn't been posted already.

Not sure if I am right or not on this but this seems to be related, at
least on my box, to the APIC IDs of the CPUs.  I am using an Intel
SE7500CW, populated with 2x XEONs.  The APIC ID's of the CPUs are 0 & 1
for the first physical CPU, and 6 & 7 for the second physical CPU (don't
ask me why).  If I don't use NR_CPUs = 8, I don't seem to see the second
physical CPU.  Someone correct me if I'm wrong.

-James

On Mon, 2 Feb 2004, Dan Christian wrote:

> I compiled a vanilla 2.4.24 for a 2 processor Xeon.
>
> I set CONFIG_NR_CPUS to 4 (2 CPUs x 2 hyperthreads each).
>
> When I boot the kernel, /proc/cpuinfo only shows 2 cpus (0-1) and
> performance is bad.
>
> I reconfigure CONFIG_NR_CPUS back to 32.  Now it shows 4 cpus (0-3) and
> performance is normal.
>
> Is this a bug or am misunderstanding how to set this configuration
> variable?
>
> -Dan Christian
>
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